It might wind up being the case that none of this matters much, because it looks like BioTracker works best with videos that have ~2.5 frames per second, and contrary to some of what I was reading, 'sleep' doesn't like fractional seconds. Which all means I might need to look into using some form of video capture instead...although maybe I'll be back at command line methods for scheduling video capture pretty quick.

I was working on that form of syntax, but then my brain didn't want to sort out the details of how to deploy the correct format for time.

The one problem I see with this is you won't exactly get an image every three seconds. `sleep` promises to sleep at least the amount of time specified but will go a few milliseconds over, and that doesn't include the time `wget` takes which can be several milliseconds easily (or longer on a slow site or network). So you'll likely wind up with about one image every 3.1 seconds or so.

The fix involves doing a little math... and likely rewriting it in Python or R or Perl or something. That is, if that actually matters.